I understand your position about the standard wrenching on your car but when a guy spends 10-20K for someone to install a Turbo Set up they are usually Married to the Builder/Tuner. I know it sounds weird but it is true in most cases.
We are not talking a naturally aspirated engine that gets tuned with a screw driver, most of these builds are pretty complex and guys that pay that kind of money are afraid to mess with it. Reason being is, lean it out and BOOM, make a mistake, BOOM, there is a very small widow for error unlike an NA Build.
